Big Atlas Weekend - June 25-27

By Doug Hitchcox June 2, 2021

If this year’s “Big Day” didn’t fit into your busy spring schedule, here’s another chance to make your birding count! How about a Big Atlas Weekend? This exciting new event is a fun way for birders from across the state to document breeding birds and come together as a birding community. For many birds in the Northeast, breeding peaks in late June. It’s a great time to confirm breeding and fill gaps in the Atlas data.

This event is being coordinated across four states that are conducting Breeding Bird Atlases right now—New York, Maine, Maryland and DC, and North Carolina.


  • June 23 @ 7 pm – Kickoff. Introduction by the four Atlas coordinators followed by guest speakers Purbita Saha and Stephanie Beilke from the Galbatross Project talking about female bird song and identification and female bird days. Watch the recording here:
  • June 24 @ 6:30 pm – Weekly Atlas Q&A with a Big Atlas Weekend focus.
  • June 25-27 – Big Atlas Weekend! Go atlasing in any of the four states from 6 pm on Friday to 11:59 pm on Sunday. 
  • June 30 @ 7 pm – Awards ceremony. Enjoy highlights from the weekend, share your stories in small groups with atlasers from all states, and find out who won the individual and state champion awards. (pre-registration required)

How to Participate

Go atlasing between 6:00 pm Friday, June 25 and 11:59 pm Sunday, June 27 and submit your checklist through the Maine Bird Atlas portal in eBird.

Challenges and Prizes

The Big Atlas Weekend will have prize opportunities for birders of all skill levels, ranging from first-time Atlasers to experienced birders conducting grassland and nocturnal surveys. One prize winner will be selected in each of the following categories to win a Cornell Lab or Ornithology Bird Academy course of their choosing, and as a special thank you for participating, every atlaser who submits a checklist will be given free access to the Be a Better Birder 1: Size and Shape course.

    • Complete Atlas checklist for the first time ever
    • Complete Atlas checklist with at least one coded species
    • Complete checklist with at least one confirmed species from a priority block
    • Complete checklist with nocturnal effort from a priority block
    • Complete checklist with at least one confirmed grassland species (NY and ME only)
    • Complete checklist of 5+ minutes for a priority block with <20 hours of diurnal effort
    • Complete checklist of 5+ minutes for a priority block with no visits

Interstate Competition

Just to make this event even more exciting, the Atlas team has set up a friendly competition between four states that are currently conducting Atlases: New York, Maine, Maryland-DC, and North Carolina.

An overall state champion will be selected based on a point system. The ranking of each state in three categories that are comparable across atlases in various stages of data collection will be used to award points. The top placing state in each category receives 23 points, second place 13 pts, and third place 7 pts. The state with the most points wins. The odd point values are chosen to help prevent ties. The number of checklists in each category will be standardized before determining rank. The categories and standardization adjustments are:

  • Nocturnal hours in priority blocks
    • Hours from complete nocturnal lists with duration
    • Adjusted for number of participants (#nocturnal hours / #participants)
  • Confirmed codes in priority blocks
    • Number of complete checklists in priority blocks that have at least one species with a confirmed code
    • Adjusted for number of blocks (#eligible checklists / #eligible blocks)
  • Atlas checklists
    • Any complete atlas checklist with at least one coded species
    • Adjusted for number of atlasers (#eligible checklists / #participants)


Who doesn’t love a bit of swag?! We’ve designed a logo for this year’s event that features the birds on each of the participating state’s Atlas logos. Order a t-shirt and other items from TeePublic. Proceeds go towards next year’s event.

Let’s all get out atlasing between June 25 and June 27 so that Maine can claim bragging rights for the inaugural Big Atlas Weekend!